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September Weather in Grafton, United States

Last updated: June 24, 2025

In Grafton, United States, the average temperature in September is a pleasant 22°C (72°F), making it an ideal time to explore. Be prepared for some variability, as temperatures can range from a cool 7°C (44°F) to a warm 35°C (95°F). During this month, you can expect an average precipitation of 66 mm (2.6 in) spread over 6 days, with humidity levels sitting at a comfortable 76%.

September Temperature in Grafton

In September in Grafton, the average temperature is 22°C (72°F). Maximums can reach 35°C (95°F), and minimums can be as low as 7°C (44°F). It's a perfect time to pack layers and enjoy a warm climate while being prepared for cooler evenings.

September Weather in Grafton: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grafton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grafton, September typically has an average temperature of 22°C (72°F), with highs reaching up to 35°C (95°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec313446546776797672584438
Data source: Temperature data for Grafton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Grafton

In Grafton in September, the precipitation amount is 66 mm (2.6 in) over the course of 6 days.

September Precipitation Trends in Grafton

The chart displays monthly precipitation patterns in Grafton, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Grafton, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec70771311191479394123661006651
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grafton

In Grafton in September humidity is 76%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as you navigate through the thick, saturated air.

September Average Humidity in Grafton

This chart illustrates the average monthly humidity levels in Grafton, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Grafton is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grafton

In Grafton in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Grafton.

Maximum UV Index Levels in Grafton for September

The chart shows the monthly maximum UV Index (UVI) for Grafton in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Grafton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111199643
Data source: Grafton September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Grafton Compares to Other Months

Weather in Grafton varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grafton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Grafton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)70 mm (2.8 inches)82%moderate
February Weather1°C (34°F)77 mm (3.0 inches)80%moderate
March Weather8°C (46°F)131 mm (5.1 inches)80%high
April Weather12°C (55°F)119 mm (4.7 inches)80%very high
May Weather19°C (67°F)147 mm (5.8 inches)82%very high
June Weather25°C (76°F)93 mm (3.6 inches)83%extreme
July Weather26°C (79°F)94 mm (3.7 inches)81%extreme
August Weather24°C (76°F)123 mm (4.9 inches)80%very high
September Weather22°C (72°F)66 mm (2.6 inches)76%very high
October Weather15°C (59°F)100 mm (3.9 inches)76%high
November Weather6°C (44°F)66 mm (2.6 inches)85%moderate
December Weather3°C (38°F)51 mm (2.0 inches)86%moderate

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